Rubber toughened polyvinyl alcohol film compositions
US4608187A · kind A · utility
30Cited by
25References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 2, 1984 |
| Grant date | Aug 26, 1986 |
| Priority date | — |
| Expiry date | Apr 2, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L21/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polymer compositions are provided which may be cast as thin, self-supporting films, useful in forming sealed envelopes or pouches containing granulated pulverulent or non-aqueous liquid materials. The cast films comprise a polymeric matrix, having at least about 50 weight percent polyvinyl alcohol, and a plurality of microdomains dispersed throughout the polymeric matrix. The films have good resistance to breakage at low temperatures and low relative humidities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.